Geoscience Reference
In-Depth Information
Fig. 26.1 Relation between
the number of soil series in a
soil order and the area of the
soil order (Gelisols not
included)
Table 26.1 Number of soil series and dominant orders of diagnostic horizons
No. of soil
series
%of
total
Dominant orders
Epipedon
Ochric
12,000
56.3
Alfisols
Aridisols, Entisols, Inceptisols
Ultisols
>
>
Oxisols
>>
Mollic
8,258
38.7
Mollisols
Alfisols
Vertisols
>>
>
Umbric
587
2.8
Inceptisols
>
Andisols
Histic
288
1.4
Histosols
Melanic
152
0.7
Andisols
Folistic
31
0.1
Histosols
Anthropic
0
0.0
-
Plaggen
0
0.0
-
Total
21,316
100.0
Subsurface horizon
Argillic
8,950
42.0
Alfisols, Mollisols
>
Aridisols
Cambic
5,960
28.0
Inceptisols
>
Mollisols, Aridisols
>
Andisols, Vertisols
Calcic
2,150
10.1
Andisols, Mollisols
Inceptisols
>
Kandic
1,353
6.3
Ultisols
Spodosols, Oxisols
>>
Albic
872
4.1
Spodosols
Alfisols
Mollisols
>
>
Duripan
787
3.7
Aridisols
Mollisols
>
Spodic
713
3.3
Spodosols
Glossic
549
2.6
Alfisols
Mollisols
>>
Fragipan
362
1.7
Alfisols
Ultisols
>
Natric
166
0.8
Aridisols
Mollisols
Vertisols
>
>>
Gypsic
131
0.6
Aridisols
Salic
97
0.5
Inceptisols
Aridisols
>
Oxic
64
0.3
Oxisols
Ortstein
47
0.2
Spodosols
Alfisols
Mollisols
>
>
Petrocalcic
32
0.2
Andisols
Mollisols
>
(continued)
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